Maximum number of atoms which are in same plane in complex which is formed as intermediate compound in Mond's process in metallurgy as vapour 
a) 12
b) 15
c) 6
d) 5

Dear student
Please find the solution to the asked query:

The Mond process involves reaction of Ni with CO,
The process has three reactions, In the second reaction, 

The impure nickel reacts with carbon monoxide at 50–60 °C to form the gas nickel carbonyl, leaving the impurities as solids.
Ni(s) + 4 CO(g) → Ni(CO)4(g)

Ni(CO)4  has a tetrahedral structure. So all 5 atoms lie in the same plane.
Hence the correct option is (d)

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